Chair-seat-surfacing machine.



Patgnted Oct. 8, 19m.

C. T. METZGEB. CHAIR SEAT SUBFAGINGIAGHINE.

(Application filed Apr. 6, 1901.)

2 Sheets-Sheet I.

Noland.)

W2" 5 nes's-es.

UNITED STATES PATENT OFFICE.

CHARLES T. HETZGER, OF UNION CITY, PENNSYLVANIA, ASSIGNOR TO KEYSTONECHAIR WORKS, LIMITED, OF SAME PLACE.

CHAIR-SEAT-SURFACING MACHINE.

SPECIFICATION forming part of letters latent No. 684,377, dated October8, 1901. Application filed April 6, 1901. Serial No. 54,628. (No model.)

To all whont it may concern.-

Be it known that 1, CHARLES T. METZGEE, a citizen of the United States,residing at Union City, in the county of Erie and State of Pennsylvania,have invented certain new and useful Improvements inChair-Seat-Surfacing Machines; and I do hereby declare the following tobe a full, clear, and exact description of theinventiomsuchas willenableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanyin g drawings,and to theletters of reference marked thereon, forming part of this specification.

My invention relates to improvements in chair-seat-surfacing machines,and has for its object the construction of mechanism whereby the surfaceof a chair-seat can be hollowed out in any desired shape and surfaced atone operation. To accomplish this result, 1 construct a machine having arotary cutter-cylinder having a portion thereof of less diameter thanthe remainder thereof, which cutter-cylinder is mounted upon a suitableframe, upon which frame there are ways or tracks which are provided withirregular surfaces, upon which a suitable carriage for holding achair-seat travels. These ways or tracks are removable, so that tracksor ways having suitable surfaces for producing any desired shape ofchair-seat surface may be used thereon.

The construction and operation of this invention are hereinafter fullyset forth and described, and illustrated in the accompanying drawings,in which-- Figure l is a top or plan view of a chairseat-surfacingmachine embodying my invention. Fig. 2 is a side view in elevation ofthe same with the driving-pulley removed. Fig. 3 is a front end view ofthe same in elevation. Fig. 4 is a side view in elevation of a way ortrack adapted to be used on the left-hand side of the machine. Fig. 5 isa like view of a way or track adapted to be used on the right-hand sideof the machine. Fig. 6 is a transverse section of the carriage travelingon said ways or tracks on the line so so in Fig. 1. Fig. 7

shows a modified construction of a way or track adapted to be used inlieu of the way ortrack shown in Fig. 4. Fig. 8 shows a modifiedconstruction of a way or track adapted to be used in lieu of the way ortrack shown in Fig. 5. r

In the drawings illustrating my invention, A is the frame of themachine, and B the shaft of a cutter-cylinder secured thereon, whichshaft is mounted in journal-boxes a a on the frame A and is providedwith a suitable driv= ing-pulley B. Upon this shaft are secured fourdisks, two of which, D D, are of equal diameter, one, D of somewhat lessdiameter, and the other, D of less diameter than D Upon these disks Isecure spiral cutter-blades d, so that they have preferablyaquarter-turn thereon, and the disks D and D being smaller than the disksD and D the cutter-blades gradually curve inward from the disk D, sothat three-fourths of the length of the cutterblades d form a curvegradually approaching the line of the shaft B and terminating at thedisk D I can, however, use other forms of cutter-cylinders havingdifferent forms of curve in this machine, if desired.

Upon the left-hand side of the top of the frame A, I secure a way ortrack E, Fig. 4, by means of brackets C O, which can be adjusted up anddown as desired, and on the right-hand side of the top of the frame A, Isecure a way or track E, Fig. 5, by means of brackets O G, which canlikewise be adjusted up and down as desired. The way or track E isprovided with depressions e e on its upper surface, as'illustrated inFigs. 1 and 4, and the way or track E is provided with depressions e e ee on its upper surface, as illustrated in Figs. 1 and 2. The forms ofthe depressions in these tracks or ways may be varied and made in anyshape required to produce such shape of depression in a chairseat as maybe desired, as the ways or tracks E E may be at any time removed andother forms of ways or tracks having difierentshaped depressions thereinsubstituted therefor.

Upon the ways E E, I place a carriage F, provided with rollers f,secured between downwardly-projecting brackets f, which extend down uponthe sides of the ways E E, so as to prevent any lateral movement of thecarriage F thereon, as the rollers f follow the depressions e and e inthe top of the tracks E E as the carriage F is moved forward and backthereon.

The carriage F is preferably made rectangular in shape and is providedwith suitable cross-bars H H in the front and rear ends thereof, whichmay be adjusted inward or outward by means of bolts h, extending throughslots f in the sides of the carriage, to suit difierentsized chair-seatsto be surfaced therein. On the lower edges of the insides of thecross-bars H H, I secure inwardly-projecting strips of sheet metal I I,upon which the edges of the sides of a chair-seat rests, and upon theinside of the left-hand side of the carriage F, I secure a like metalstrip I, upon which the edge of the rear end of the chair-seat rests, sothat the chair-seat rests in the carriage F upon the metal strips I, I,and I, as illustrated by the dotted lines in Fig. 1.

For holding the seat in place thereon I hinge a lever J to the center ofthe rear of the carriage F at J, which arm is provided with cross-bars JJ on the under surface of the ends of which there are secured disksjj,of rubber or other resilient substance, as illustrated in Fig. 6. Thelever J terminates in a handle J which projects outward in front of thecarriage F and is provided with a spring-actuated catch K, which engagesa stop K on the carriage F, so as to secure the lever J down upon achair-seat placed in the carriage F.

On the ways or tracks E E, I secure stops mm at the rear ends thereofand m m at the front ends thereof to limit the travel of the carriage Fforward and back thereon. On the front end of one of the ways or tracksE, I secure another stop m, adapted to be engaged with a spring-actuatedbolt M on the front of the carriage F, so as to prevent the carriage Fmoving forward until released.

Under the corners of the rear end of the carriage F, I place rollers 01,adapted to engage supplementary tracks N N and carry the rear end of thecarriage F over one of the depress-ions in the 'ways or tracks E Eduring the latter portion of its backward movement, so that the rear endof the carriage will pass over the cutter-cylinder, which operates as asafety device during the placing ofchair-seats in and removing them fromthe Y carriage.

In Figs. Tand 8 I have shown modified forms of the ways or tracks usedupon this machine, consisting of making the ways E and E with slots 6and 2 in which the carriage-supporting. rollers f travel, whichconstruction operates to prevent the carriage F from being raised offthe ways or tracks. I can, however, use either construction of ways ortracks desire, as both types thereof accomplish good results. I prefer,however, the type of way or track E E, as I can then scribed.

I have thus shown and described a construction of mechanism suitable forutilizing my invention. I do not, however, desire to confine myself tothe exact construction thereof shown and described, as I am aware thatmany modifications can be made by those skilled in the art to which myinvention appertains without departing from the spirit of my invention.Therefore That I claim as new, and desire to secure by Letters Patent ofthe United States, is

l. The combination in a chair-seat-surfacing machine,'of a frame, arotary spirallybladed cutter-cylinder mounted in said frame and havingone end thereof of less diameter drawn back, substantially as and forthe pur I pose set forth. V

2. The combination in a chair-seat-surfacing machine, of a frame, arotary spirallybladed cutter-cylinder mounted in said frame and havingone end thereof of less diameter than the other, longitudinal ways ortracks adjustably secured to said frame having unlike bearing-s11 rfacesthereon, a carriage having rollers thereon adapted to travel back andforth on said ways, stops on saidways to limit the travel of thecarriage, supports in said carriage adapted to support a chair-seat, anarm secured to said carriage adapted to secure a chair-seat down uponthe supports therein, a springactuated catch on said arm, and aspring-actuated bolt on said carriage adapted to engage a stop on one ofthe ways or tracks, a supplementary safety-track secured to said frame,and rollers on the rear end of said carriage adapted to engage saidsupplementary track when the carriage is than the other, longitudinalways or tracks 7 s i utilize the safety mechanism hereinbefore de- Intestimony whereof I affix my signature in presence of two witnesses.

CHAS. 'l. METZGER.- \Vitnesses:

HARRY BRooKING'roN, O. B. MULKIE.

V drawn back, substantially as and for the purpose set forth.

